Periods will affect almost every single woman one way or another and will stay with us for approximately 37.5 years of a woman's life. A woman will menstruate for an equivalent duration of 6.5 years of her life. On average, women will have 500 periods over their lifetime, which equals 3,500 days spent menstruating, this amounts to over 10,000 period products in one lifetime. Women in Europe spend around €675 every year on menstrual hygiene products. Based on an average menstrual lifetime of at approximately 40 years, this comes to a total outlay of around €27,000, before taking into account related costs for pharmacological or pain-alleviating products. Of course, each woman is unique so that number will vary, but understanding your cycle is important since you will have so many thr ...